XO-7 b: A Transiting Hot Jupiter with a Massive Companion on a Wide Orbit

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Crouzet, N (Author) Other; Healy, BF (Author) Other; Hebrard, G (Author) Other; McCullough, PR (Author) Other; Long, D (Author) Other; Montanes Rodriguez, P (Author) Other; Ribas, I (Author) Other; Vilardell, F (Author) Other; Herrero, E (Author) Other; Garcia Melendo, E (Author) Other; Conjat, M (Author) Other; Foote, J (Author) Other; Garlitz, J (Author) Other; Vo, P (Author) Other; N.C. Santos (Author) FCUP; de Bruijne, J (Author) Other; Osborn, HP (Author) Other; Dalal, S (Author) Other; Nielsen, LD (Author) Other

Journal

Title: Astronomical Journal

Vol. 159

Final page: 44

ISSN: 0004-6256

Publisher: American Astronomical Society

Indexing

ISI Web of Knowledge - 4 Citations

Scopus - 3 Citations

Other information

Authenticus ID: P-00R-XCH

DOI: 10.3847/1538-3881/ab5b12

Abstract (EN): Transiting planets orbiting bright stars are the most favorable targets for follow-up and characterization. We report the discovery of the transiting hot Jupiter XO-7 b and of a second, massive companion on a wide orbit around a circumpolar, bright, and metal-rich G0 dwarf (V.=.10.52, Teff = 6250. 100 K, [Fe H] = 0.432. 0.057 dex). We conducted photometric and radial velocity follow-up with a team of amateur and professional astronomers. XO-7 b has a period of 2.8641424. 0.0000043 days, a mass of 0.709. 0.034 MJ, a radius of 1.373. 0.026 RJ, a density of 0.340. 0.027 g cm-3, and an equilibrium temperature of 1743. 23 K. Its large atmospheric scale height and the brightness of the host star make it well suited to atmospheric characterization. The wide-orbit companion is detected as a linear trend in radial velocities with an amplitude of 100 m s-1 over two years, yielding a minimum mass of 4 MJ; it could be a planet, a brown dwarf, or a low-mass star. The hot Jupiter orbital parameters and the presence of the wide-orbit companion point toward a high-eccentricity migration for the hot Jupiter. Overall, this system will be valuable to understand the atmospheric properties and migration mechanisms of hot Jupiters and will help constrain the formation and evolution models of gas giant exoplanets.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11